Internal orifice of the uterus

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Internal orifice of the uterus
Posterior half of uterus and upper part of vagina.
Latin orificium internum uteri
Gray's subject #268 1259
Dorlands/Elsevier o_06/13554423

The internal orifice of the uterus (or internal orifice of the cervix uteri or internal os) is an interior narrowing of the uterine cavity. It corresponds to a slight constriction known as the isthmus that can be observed on the surface of the uterus about midway between the apex and base.

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.